Research Paper
Typical Highway Geometric Design Method
- Abstract
- The Typical Highway Geometric Design Method is the way to selecting the best typical road design from a number of alternatives that according to specifications and is lowest expensive.
- Problem Statement
- The current road design method is considered a semi-manual method and uses engineering programs software’s as a display and output rather than searching and comparing between the best alternatives of different designs, and also produces a large number of differences in the cost and method of applying the limitations when the same inputs to road design engineers.
- Objectives:
- Proving that The Typical Highway Geometric Design Method is considered the best method for designing, comparing and searching between different alternatives to reach the best design that according to specifications and at the lowest cost.
Research Methodology
- There are two methods to apply The Typical Highway Geometric Design Method.
- The First Method: Semi-automatic
It is a method of entering and modifying information for current engineering design programs manually using the trial-and-error method to reach the best results. This method requires a lot of time, but for its ease, research has been adopted on it and engineering programs software’s have been used for output. It is used in simple road projects that small length and few parameters, it is not useful in large roads for difficulty of its application.
- The Second Method: Automatic
- It is a method of entering information into engineering design programs, so the road is designed automatically and search between the different alternatives to reach the best design that matches the specifications and lowest cost and less time. Unfortunately, it cannot be applied currently because the current engineering design programs need to be updated and developed in their method of working with the Typical Highway Geometric Design.
- Data Collecting and analyzing.
- The semi-automatic method was used to design a number of roads using The Typical Highway Geometric Design Method for design them. It started with the simplest example, which is a road that contains a straight alignment, a straight profile, a fixed typical cross section, and flat natural ground. The remaining examples have variables that have been limited for ease to three variables: (alignment - profile - typical cross section linked to natural ground).
- Therefore, two variables were fixed in each example and the third variable was modified to find the ideal relationship between them
- In each example the lowest cost cross section has been given.
- Number of applied examples (18) (attached in the appendix)
- Results and Discussion
- From the results of the previous examples, I concluded that each road has a unique design that according to the specifications and is the lowest cost when applying the Typical Highway Geometric Design Method to design it.
- Updating engineering programs software’s to suit the application of The Typical Highway Geometric Design Method using the automatic method.
- Adopting The Typical Highway Geometric Design Method to be taught in universities.
References
- BOOK (The Typical Highway Geometric Design Method 2014) Engineer Fawaz Al-Ansi.
